Switch knob



July 1, 1930. V T. L. PARKER 1,169,543

SWITCH KNOB Original Filed Dec. 27, 1926 Patented July 1, 1930 Ni D ewe -THOMAS L. PARKER, or onIcAeo, I NOIS;As'sIGnonTo mesmmann nLnc'rmc 'MANUFAGTURING (10., OF CHICAGO, ILLINOIS, A CORPORA ION or inninors' SWITCH Knot:-

Original application filed December 27, 1926, ScriaIJNo. 157,184. Divided andthis application emanate-11 1,

1928-. Serial No. 258,197.

1 This'invention relates to-improvements in switch knobs and'more particularly to'knobs of the character which are used in connection with snap switches. 5 An object of applicants production of aswitch knob which may be quickly assembled and attached to the'stem of-a rotary snap switch, thereby effecting. a great saving intime. i a V rinother object of applicants invention is the production of a-knob for arotary snap switch which will resiliently secure the, cover for the movable parts in place. I

Another object of applicants invention 1s the'production of 'a construction which will permit the use for switch knobsof materials such as porcelain and others in which metals are not readily molded or cast. A further object of applicants invention is the provision of a switch knob of the above .type including in its construction, preferably a noncond uctive body having a boreand a sleeve positioned within the bore with a coil spring surrounding the same together wlth improved means seated within the outer open end of the bore cooperating with the sleeve whereby to restrain displacement of the sleeve.

A further, object of applicants invention is the production of a switch knob of low cost,

durable of a small number of parts, and

I highly satisfactory forits intended purpose. Many other objects and advantages of the construction herein shown and described will" be obvious to those skilled in the artfrom the disclosure herein given.

To this end my invention consists in the novel construction, arrangement and combi and more particularly claims.

in the. drawing,

pointed out in the wherein like. reference characters indicate like or corresponding parts i 7 d V Fig. 1 is a top plan view of a device applied to a rotary type of electrical switch;

" Fig. 2is a sectional. elevation thereof;

Fig. 3 is an bore; 7

form of the invention; and I Fig. 6 'isa sectional-elevation'of another nodified' form of the invention.

invention is the with Wings at. Within the base 3 5 of a contour such that the head 6 on the sleeve is constrained to' rotate with the base nation of parts herein shown and described,

end elevation looking into the i contouroftheqwall.

I Fig. 4 is'a perspective view the sleeve and spring retaining member;

Fig. 5 is a sectional elevation of a modified 7 Referring now to the drawing in F ig; 1 is shown the improved switch knob 1 applied to a snap switch generally indicated by the reference character 2. At 2" is shown thecover for the contact assembly. The knob consists of a base 3 which may be of any suitable contour such as round,'oblong etc, and is shown is a bore 3 butmay move in and out of the bore 5. The term sleeveliis here used to include a solid or partially solid construction. About the sleeve 7 is aspring 8 Acombined sleeve sup- -21 .portmgsprmg retaining member 9 1s positioned within the end of bore and preferably 7 in an enlargedportion 10 thereof. The memher 91s formed w th an aperture 11 at the center thereof and preferably with a plurality of whichfis molded with anundercut so that it ing a tapering wall as shown at,13,and pro; viding a substantialancl orfor the fingers 12.

Anypther means forsecuringthe sleeve 7 to the stem 15 obviously maybe provided. In assembling, the sleeve 7 is. positioned such that the head 6 thereof passes intorbore Sfirst. Thespring S is then slipped over the sleeve -7 and. the combined: spring retaining sleeve f supporting member 9,is then pushed into the emerged pOrtionlO withgthe. fin ers 12 point v ing outward... When the -=membe rf 9fen'ga'ges the shoulder 16, the fingers 12 due to; their resiliency firmly engage the .walls'f'o'ftheibore, 10fand. are lockedinj place "due, the shape .fingersf12'atit'souteredgegpThe fingers 12 are preferablyresilient in character and engage the inner wall. ofthe enlargementlO a .3 The sleeve? maybe formed with a bore14-. .whichis threaded to Iscrewonto a stem 15.

V tions nay beg nadein"the sztihe Without de-- similar to thefo'rm shown in Fig. '2 except" that a bead 171s provided in the enlargement 10, as an anchor for the fingersilQQ and the'en c 1arge1nent'10otherwisernay heof iiniform" diameter." i Intheform shown in Fig. 6', the en; "largernentmay be-imore or lessjof imiform dia I emetet ert hafi a a s u ergori n appending application Serial No. I 18 4e,

lHavingi thus de'so partingv froInLthe spirit of my; invention;

hence; Ido not to: he understood-as 1in'1- 'itinj selfto the ex actcfor ni construction, en'ijent endfconibinstionof pert s'herein r 7 adescfibedm usesinentioned. 7 t dvhjt lfcl ziimnsnew anddesireto' secure Letters is z; j i A deg ice' of the portionrhaving a bore, said borehaving an enelarged end this r rmifl qa; shoulder; it sleeve "With, ani nlar ged foo ion arrange'd Within said bore conspi e ed to rotalte with said body portion, at niernber izvithin-seidenlarged fend ofsaid bore eilnbraing s'aid" sleeve,

"of the ber t, member mounted onthe sleeve intheenlarged portion of the bore, said memsleefvefnieans for retaining said member V I lagelnstsald first mentioned shonlder, said kifid d gc ib d, a b dy means comprising forwardly extending finmentioned shoulder."

signed my {name mounted on the sleeve'inthe enlargedportion ofthe bore, said member having a plurality of 'detent fingers engaging said restricted portion of the bore.

5. In -2t deviceofthekind described, a body heving'e bore closed atone end the open end oi said bore being' enlarged, thus forming a "shoulder, walls of the enlarged portion of said bO're heingfconstricted adj scent the, open end her abutting said shoulder and'having aphirality of forwardly'extending ,detent' fingers engaging the restricted portion of said'bore.

1 6. In a device of the kind described, a body fhai ingnbore closed at one end, the open end of said bore being enlarged, thus forming a shoulder, a constricted portion in said e11- lerged portion of the bore forminga shoulder oppositely'disposed to the first mentioned shoulder, a sleevearranged within said bore and projecting into said enlarged end, a member-Within said enlarged end and abutting said shoulder, said member embracing said gers on said-member engaging said second 7 In testimony whereof, Ihtve hereunto T OMAS L; TARKER.

g or t si idinember abdttixig said shoulder, fin ers on said inernhennnd meatnsin" sz tid'enlarged 190 t f portion of said borefofming anabuft'ment for said fingers; I j j I 1' Q p 2. Ade'vice of-the kind described,,abody ne fii n h i'ng .mb 'h 's e ei ith an 1- ilarg di t sli ab y a ra ge Wi w' I? r v r bore endcionstraginedito rotatewithfsaid body 1 ]=1 -porti6n,a mber withinseidbore and fit- -t sdie id-l i iyei ib r p o ed aiplui ality offingrgmf nsin said bore rqrmingssab tment-fo s'aid fingers; were? 1 t siiienqmegns engagingsaid niemb'er vand said i "delete. "m d s ibed; b d y e dlbo e nen- T51 shoulder, a sleeverwith 

